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<pre><code>8
1 abc
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<pre><code>c
y
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<pre><code class="lang-Java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Main</span> </span>{

    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> Stack&lt;Integer&gt; stack;<span class="hljs-comment">//&#x4FDD;&#x5B58;&#x64CD;&#x4F5C;&#xFF0C;&#x65B9;&#x4FBF;&#x56DE;&#x6EDA;&#xFF08;&#x53EA;&#x4FDD;&#x5B58;1&#xFF0C;2&#xFF09;</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span>[] command;<span class="hljs-comment">//&#x547D;&#x4EE4;&#x6570;&#x7EC4;</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> String[] val;<span class="hljs-comment">//&#x547D;&#x4EE4;&#x5BF9;&#x5E94;&#x7684;&#x503C;&#x7684;&#x6570;&#x7EC4;</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> StringBuilder str;<span class="hljs-comment">//&#x6587;&#x672C;&#x6846;&#x4E2D;&#x7684;&#x5185;&#x5BB9;</span>
    <span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> Stack&lt;String&gt; del;<span class="hljs-comment">//&#x5220;&#x9664;&#x64CD;&#x4F5C;&#x5220;&#x9664;&#x7684;&#x5B57;&#x7B26;&#x4E32;</span>

    <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> </span>{
        Scanner s = <span class="hljs-keyword">new</span> Scanner(System.in);
        str = <span class="hljs-keyword">new</span> StringBuilder();
        <span class="hljs-keyword">int</span> N = s.nextInt();
        command = <span class="hljs-keyword">new</span> <span class="hljs-keyword">int</span>[N];
        val = <span class="hljs-keyword">new</span> String[N];
        <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i &lt; N; i++) {
            command[i] = s.nextInt();
            val[i] = s.nextLine();
        }
        <span class="hljs-comment">//&#x53BB;&#x9664;&#x8F93;&#x5165;&#x7684;&#x7A7A;&#x683C;</span>
        <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i &lt; val.length; i++) {
            <span class="hljs-keyword">if</span> (!val[i].equals(<span class="hljs-string">&quot;&quot;</span>)) {
                StringBuilder ss = <span class="hljs-keyword">new</span> StringBuilder(val[i]);
                ss.deleteCharAt(<span class="hljs-number">0</span>);
                val[i] = String.valueOf(ss);
            }
        }

        stack = <span class="hljs-keyword">new</span> Stack&lt;&gt;();
        del = <span class="hljs-keyword">new</span> Stack&lt;&gt;();

        <span class="hljs-comment">//&#x904D;&#x5386;&#x547D;&#x4EE4;&#x5B57;&#x7B26;&#x4E32;&#x6570;&#x7EC4;&#xFF0C;&#x4F9D;&#x6B21;&#x6267;&#x884C;&#x547D;&#x4EE4;</span>
        <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i &lt; N; i++) {
            <span class="hljs-comment">//&#x547D;&#x4EE4;1&#xFF0C;&#x8FFD;&#x52A0;&#x5B57;&#x7B26;&#x4E32;</span>
            <span class="hljs-keyword">if</span> (command[i] == <span class="hljs-number">1</span>) str.append(val[i]);
            <span class="hljs-comment">//&#x547D;&#x4EE4;2&#xFF0C;&#x5220;&#x9664;&#x5B57;&#x7B26;&#x4E32;</span>
            <span class="hljs-keyword">if</span> (command[i] == <span class="hljs-number">2</span>) {
                <span class="hljs-comment">//&#x5C06;&#x5220;&#x9664;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x5B58;&#x5165;del&#x6808;&#x4E2D;&#xFF0C;&#x65B9;&#x4FBF;&#x56DE;&#x6EDA;</span>
                <span class="hljs-keyword">if</span> (Integer.parseInt(val[i]) &gt;= str.length()) del.push(String.valueOf(str));
                <span class="hljs-keyword">else</span> del.push(str.substring(str.length() - Integer.parseInt(val[i]), str.length()));
                <span class="hljs-comment">//&#x5220;&#x9664;&#x5B57;&#x7B26;&#x4E32;</span>
                <span class="hljs-keyword">if</span> (Integer.parseInt(val[i]) &gt;= str.length()) str.delete(<span class="hljs-number">0</span>, str.length());
                <span class="hljs-keyword">else</span> str.delete(str.length() - Integer.parseInt(val[i]), str.length());
            }
            <span class="hljs-comment">//&#x547D;&#x4EE4;3&#xFF0C;&#x8F93;&#x51FA;&#x5B57;&#x7B26;</span>
            <span class="hljs-keyword">if</span> (command[i] == <span class="hljs-number">3</span>) {
                <span class="hljs-keyword">int</span> index = Integer.parseInt(String.valueOf(val[i])) - <span class="hljs-number">1</span>;
                System.out.println(str.charAt(index));
            }
            <span class="hljs-comment">//&#x547D;&#x4EE4;4&#xFF0C;&#x56DE;&#x6EDA;</span>
            <span class="hljs-keyword">if</span> (command[i] == <span class="hljs-number">4</span>) rollback();
            <span class="hljs-comment">//&#x547D;&#x4EE4;1&#xFF0C;2&#x4F9D;&#x6B21;&#x5165;&#x6808;&#xFF0C;&#x5B58;&#x50A8;&#x7684;&#x662F;&#x6570;&#x7EC4;&#x7684;&#x7D22;&#x5F15;</span>
            <span class="hljs-keyword">if</span> (command[i] != <span class="hljs-number">4</span> &amp;&amp; command[i] != <span class="hljs-number">3</span>) stack.push(i);
        }
    }

    <span class="hljs-comment">//&#x56DE;&#x6EDA;&#x51FD;&#x6570;</span>
    <span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">rollback</span><span class="hljs-params">()</span> </span>{
        <span class="hljs-keyword">int</span> index = stack.pop();<span class="hljs-comment">//&#x83B7;&#x53D6;&#x6808;&#x9876;&#x5143;&#x7D20;&#xFF0C;&#x5373;&#x4E0A;&#x4E00;&#x6B21;&#x6267;&#x884C;&#x7684;&#x64CD;&#x4F5C;&#x7684;&#x6570;&#x7EC4;&#x7D22;&#x5F15;</span>
        <span class="hljs-keyword">int</span> cmd = command[index];<span class="hljs-comment">//&#x6839;&#x636E;&#x7D22;&#x5F15;&#x83B7;&#x53D6;&#x547D;&#x4EE4;</span>
        String value = val[index];<span class="hljs-comment">//&#x6839;&#x636E;&#x7D22;&#x5F15;&#x83B7;&#x53D6;&#x547D;&#x4EE4;&#x5BF9;&#x5E94;&#x7684;&#x503C;</span>
        <span class="hljs-comment">//&#x4E0A;&#x6B21;&#x547D;&#x4EE4;&#x4E3A;1&#xFF0C;&#x8FFD;&#x52A0;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x56DE;&#x6EDA;&#x5219;&#x5220;&#x9664;&#x8FFD;&#x52A0;&#x7684;&#x5B57;&#x7B26;&#x4E32;</span>
        <span class="hljs-keyword">if</span> (cmd == <span class="hljs-number">1</span>) {
            <span class="hljs-keyword">int</span> len = value.length();
            str.delete(str.length() - len, str.length());
        }
        <span class="hljs-comment">//&#x4E0A;&#x6B21;&#x547D;&#x4EE4;&#x4E3A;2&#xFF0C;&#x5220;&#x9664;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x56DE;&#x6EDA;&#x5219;&#x8FFD;&#x52A0;&#x5220;&#x9664;&#x7684;&#x5B57;&#x7B26;&#x4E32;</span>
        <span class="hljs-keyword">if</span> (cmd == <span class="hljs-number">2</span>) str.append(del.pop());
    }

}
</code></pre>
<h2 id="&#x6587;&#x7AE0;&#x7FFB;&#x8BD1;">&#x6587;&#x7AE0;&#x7FFB;&#x8BD1;</h2>
<h3 id="&#x9898;&#x76EE;&#x63CF;&#x8FF0;">&#x9898;&#x76EE;&#x63CF;&#x8FF0;</h3>
<blockquote>
<p>&#x8F93;&#x5165;&#xFF1A;
&#x7B2C;&#x4E00;&#x884C;&#x8868;&#x793A;&#x6587;&#x7AE0;&#xFF0C;&#x957F;&#x5EA6;&#x4E0D;&#x8D85;&#x8FC7;50000
&#x7B2C;&#x4E8C;&#x884C;&#xFF0C;&#x6B63;&#x6574;&#x6570;[2,50000]&#xFF0C;&#x5B57;&#x5178;&#x5355;&#x8BCD;
N&#x884C;&#xFF0C;&#x6BCF;&#x884C;&#x4E00;&#x4E2A;&#x5355;&#x8BCD;
&#x8F93;&#x51FA;:
&#x6587;&#x7AE0;&#x7FFB;&#x8BD1;&#x79CD;&#x6570;&#x5BF9;835672545&#x53D6;&#x4F59;
&#x65E0;&#x6CD5;&#x7FFB;&#x8BD1;&#x8F93;&#x51FA;0</p>
</blockquote>
<h3 id="&#x793A;&#x4F8B;&#x8F93;&#x5165;">&#x793A;&#x4F8B;&#x8F93;&#x5165;</h3>
<pre><code>abcba
5
ab
cb
bc
ba
a
</code></pre><h3 id="&#x793A;&#x4F8B;&#x8F93;&#x51FA;">&#x793A;&#x4F8B;&#x8F93;&#x51FA;</h3>
<pre><code>2
</code></pre><h2 id="&#x889C;&#x5B50;&#x67D3;&#x8272;">&#x889C;&#x5B50;&#x67D3;&#x8272;</h2>
<h3 id="&#x9898;&#x76EE;&#x63CF;&#x8FF0;">&#x9898;&#x76EE;&#x63CF;&#x8FF0;</h3>
<blockquote>
<p>&#x7B2C;i&#x5929;&#x7A7F;&#x889C;&#x5B50;a_i&#x548C;b_i&#xFF0C;&#x8981;&#x6C42;&#x989C;&#x8272;&#x6807;&#x53F7;&#x76F8;&#x540C;
&#x7B2C;&#x4E00;&#x884C;&#x4E24;&#x4E2A;&#x6574;&#x6570;n&#xFF08;&#x889C;&#x5B50;&#x6570;&#x91CF;&#xFF09;&#x548C;m&#xFF08;&#x5929;&#x6570;&#xFF09;&#x5747;&#x5C0F;&#x4E8E;100,000
&#x7B2C;&#x4E8C;&#x884C;n&#x4E2A;&#x6574;&#x6570;&#xFF0C;&#x7B2C;i&#x4E2A;&#x6570;c_i&#x8868;&#x793A;&#x7B2C;i&#x53EA;&#x889C;&#x5B50;&#x989C;&#x8272;&#xFF0C;&#x4E0D;&#x5927;&#x4E8E;100,000
&#x63A5;&#x4E0B;&#x6765;m&#x884C;&#xFF0C;&#x6BCF;&#x884C;&#x4E24;&#x4E2A;&#x6574;&#x6570;a_i&#x548C;b_i&#xFF0C;&#x8868;&#x793A;&#x7B2C;i&#x5929;&#x7A7F;&#x7684;&#x889C;&#x5B50;&#x7F16;&#x53F7;
&#x8F93;&#x51FA;&#x6700;&#x5C11;&#x9700;&#x8981;&#x67D3;&#x8272;&#x6570;</p>
</blockquote>
<h3 id="&#x793A;&#x4F8B;&#x8F93;&#x5165;">&#x793A;&#x4F8B;&#x8F93;&#x5165;</h3>
<pre><code>3 2
1 2 3
1 2
2 3
</code></pre><h3 id="&#x793A;&#x4F8B;&#x8F93;&#x51FA;">&#x793A;&#x4F8B;&#x8F93;&#x51FA;</h3>
<pre><code>2
</code></pre><h2 id="&#x548C;&#x732B;&#x54AA;&#x73A9;&#x6E38;&#x620F;">&#x548C;&#x732B;&#x54AA;&#x73A9;&#x6E38;&#x620F;</h2>
<h3 id="&#x9898;&#x76EE;&#x63CF;&#x8FF0;">&#x9898;&#x76EE;&#x63CF;&#x8FF0;</h3>
<blockquote>
<p>&#x9996;&#x5148;&#x8F93;&#x5165;&#x5B57;&#x7B26;&#x4E32;s
&#x4E00;&#x884C;&#x8F93;&#x5165;&#x4E00;&#x4E2A;n&#xFF0C;&#x8868;&#x793A;&#x63A5;&#x4E0B;&#x6765;&#x6709;n&#x4E2A;&#x64CD;&#x4F5C;
&#x63A5;&#x4E0B;&#x6765;n&#x884C;&#xFF0C;&#x6BCF;&#x884C;&#x8868;&#x793A;&#x4E00;&#x4E2A;&#x64CD;&#x4F5C;
&#x4FEE;&#x6539;&#xFF1A;1 &#x6574;&#x6570;pos &#x4E00;&#x4E2A;&#x5B57;&#x7B26;c &#x8868;&#x793A;&#x5C06;&#x6574;&#x6570;&#x66FF;&#x6362;&#x4E3A;c
&#x63D0;&#x95EE;&#xFF1A;2 l r  &#x6C42;s[l...r]&#x6709;&#x591A;&#x5C11;&#x4E2A;&#x4E92;&#x4E0D;&#x76F8;&#x540C;&#x7684;&#x5B57;&#x7B26;</p>
</blockquote>
<h3 id="&#x793A;&#x4F8B;&#x8F93;&#x5165;">&#x793A;&#x4F8B;&#x8F93;&#x5165;</h3>
<pre><code>abacaba
5
2 1 4
1 4 b
1 5 b
2 4 6
2 1 7
</code></pre><h3 id="&#x793A;&#x4F8B;&#x8F93;&#x51FA;">&#x793A;&#x4F8B;&#x8F93;&#x51FA;</h3>
<pre><code>3
1
2
</code></pre>
                                
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